The bemusement and fascination with her top appears to stem from the fact when you first look at the photo it's hard to notice anything - but once the neckline's shape is pointed out it's hard to "unsee" it.
Ruben Haywood wrote on Facebook, garnering 26,408 likes: "Like if you came here to find out what it is."
Sarah Herbert wrote: "Yep, definitely cannot unsee this now." And Chris Thompson added: "Thank you, you have enlightened me on this picture."
"You legend I couldn't find what was happening but you've made me at ease now," Adam Baldwin said.
And Lourens Odendaal realised: "Ooo that's what it was... now I get it."
Meanwhile, on Reddit, one commentator mused: "I thought it was because her microphone looks like the claw of a monster about to burst from her chest."
And another added: "I thought it was the slight crease in her v neck on the right side, yet the top was the same length... I was sure it wasn't that so came to the comments.
"I guess this means I'm growing up, because five years ago I'd see this straight away."
The jacket, designed by Australian label Scanlan Theodore, was previously worn by Channel Seven's Melissa Doyle in a fetching cream shade.
The Crepe Knit Double Peplum Jacket is still available to buy on Scanlan Theodore's website, after Doyle wore the design five days ago.
But phallic looking necklines are nothing new, as a 2010 photo of the ABC's Leigh Sales in a more extreme black number shows, the Sydney Morning Herald reports.
- Daily Mail